单词	root
释义	noun | verb rootroot1 /rut, rʊt/ ●●● S2 W2 noun [countable] Etymology ETYMOLOGYroot1 Origin: 1100-1200 Old Norse rot Collocations COLLOCATIONS► be/lie at the root of something  Allergies are at the root of a lot of health problems. ► get to the root of the problem  A good mechanic should be able to get to the root of the problem. ► root cause  What do you see as the root cause (=main reason) of the Civil War? ► has its roots in  Jazz has its roots in the folk songs of African-American culture. ► be/lie at the root of something  Biblical writings lie at the root of Western culture. ► return to ... roots  He decided to return to his East Coast roots after his marriage failed. Thesaurus THESAURUS the situation, place, cause, etc. from which something begins► origin the situation, place, cause, etc. from which something begins:  Valentine’s Day has its origins in third-century Rome (=it began then). ► source the thing, place, or person that you get something from:  Tourism is the country’s main source of income. a source of energy ► root the most important reason or cause of something, especially a problem or something bad:  The root of the problem is money. ► etymology the origin of a word, or the study of the origins of words in general:  What is the etymology of the word “sugar”? ► birthplace the place where someone, especially someone famous, was born:  We visited Martin Luther King’s birthplace in Atlanta. 1PLANT science, biology the part of a plant or tree that grows under the ground and gets water and minerals from the soil:  Cover the roots with plenty of soil. tree roots2CAUSE OF A PROBLEM the main cause of a problem: root of The roots of the problem are very complex.be/lie at the root of something Allergies are at the root of a lot of health problems. A good mechanic should be able to get to the root of the problem. What do you see as the root cause (=main reason) of the Civil War?3ORIGIN/MAIN PART the origin or main part of an idea or belief which all the other parts come from:  Jazz has its roots in the folk songs of African-American culture.be/lie at the root of something Biblical writings lie at the root of Western culture.► see thesaurus at origin4FAMILY CONNECTIONS somebody’s roots a place that you are connected to because you or your family come from it:  He decided to return to his East Coast roots after his marriage failed.5TOOTH/HAIR ETC. the part of a tooth, hair, etc. that connects it to the rest of your body6put down roots if you put down roots somewhere, you start to feel that this place is your home and to have relationships with the people there:  Just as I was putting down roots, our family had to move up north.7take root a)if an idea, method, activity, etc. takes root, people begin to accept or believe it:  The theory is slowly taking root in our schools. b)if a plant takes root, it starts to grow where you have planted it8LANGUAGE eng. lang. arts the basic part of a word that shows its main meaning, to which other parts can be added. For example, the word “coldness” is formed from the root “cold” and the suffix “-ness.” → stem9MATH math a number that, when it is multiplied by itself a particular number of times, equals the number that you have:  2 is the fourth root of 16 (2 × 2 × 2 × 2 = 16).[Origin: 1100–1200 Old Norse rot] → see also cube root, grass roots, square root noun | verb rootroot2 verb Etymology ETYMOLOGYroot2 Origin: (1-2, 4-5) 1200-1300 ➔ ROOT1 (3) Old English wrotan. root for 1800-1900 Perhaps from rout (of cattle) to make a loud sound (14-19 centuries), from Old Norse rauta Verb Table VERB TABLE root Simple Form Present I, you, we, they root he, she, it roots Past I, you, he, she, it, we, they rooted Present perfect I, you, we, they have rooted he, she, it has rooted Past perfect I, you, he, she, it, we, they had rooted Future I, you, he, she, it, we, they will root Future perfect I, you, he, she, it, we, they will have rooted Continuous Form Present I am rooting he, she, it is rooting you, we, they are rooting Past I, he, she, it was rooting you, we, they were rooting Present perfect I, you, we, they have been rooting he, she, it has been rooting Past perfect I, you, he, she, it, we, they had been rooting Future I, you, he, she, it, we, they will be rooting Future perfect I, you, he, she, it, we, they will have been rooting 1[intransitive always + adv./prep.] informal to search for something by moving things around SYN rummage: root through/in/around I rooted through my purse for a pen and a notebook.2[intransitive always + adv./prep.] if an animal roots somewhere, it looks for food under the ground with its nose3a)[intransitive] science, biology to grow roots:  New shrubs will root easily in summer. b)root itself if a plant roots itself, it makes itself fixed in the ground or between rocks, bricks, etc. by growing roots:  Weeds had rooted themselves between the rocks.root for somebody phrasal verb informal1to want someone to succeed in a competition, test, or difficult situation:  We’re all rooting for you, Bill.2to support a sports team or player by shouting and cheering:  Most of the crowd was rooting for Foreman.root something ↔ out phrasal verb1to find out where a particular kind of problem exists and get rid of it:  Drastic measures have been taken to root out corruption.2to find something by searching for it:  I’ll have to root his address out.root something ↔ up phrasal verb to dig or pull a plant up with its roots
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