verb | noun
sinksink1 /sɪŋk/ ●●● W3 verb (past tense sank /sæŋk/ or sunk /sʌŋk/, past participle sunk) 1
IN WATER [intransitive] to go down below the surface of water, mud, etc. OPP float: He threw in a coin, and it sank to the bottom of the pool. The boat sank after hitting a rock. The guns were sinking deeper and deeper in the mud.2DAMAGE SHIP [transitive] to damage a ship so badly that it goes down below the surface of water: Three ships were sunk that night by enemy torpedoes.3MOVE LOWER [intransitive] to move down to a lower level: The building’s foundations have sunk several inches in recent years. Gradually, the sun sank below the horizon.4FALL/SIT DOWN [intransitive] to fall down or sit down heavily, especially because you are very tired and weak: sink into/on/down etc. Tom sank down on the sofa, completely exhausted.5GET WORSE [intransitive always + adv./prep.] to gradually get into a worse condition: sink into crisis/despair/decay etc. The country was sinking into political crisis. Two days after the accident, Joyce sank into a coma.6LOWER AMOUNT/VALUE [intransitive] to go down in amount or value SYN drop: The price of crude oil could sink even further.7SPORTS [transitive] to put a ball into a hole or basket in games such as golf or basketball: Pierce sank a three-point basket two minutes into the game.8somebody’s heart sinks (also somebody’s spirits sink) used to say that someone loses hope or confidence: My heart just sank when I read Patty’s letter.9be sunk spoken to be in a situation when you are certain to fail or have a lot of problems: If that check doesn’t come today, we’re really sunk.10sink like a stone/rock (also sink without a trace) a)if something in water sinks like a stone, it sinks to the bottom very quickly b)if someone or something sinks like a stone, it is not popular and people forget about it very quickly: The movie sank like a stone.11DIG INTO GROUND [transitive] if you sink something such as a well or part of a building, you dig a hole to put it into the ground: The first exploratory oil well was sunk in late 1987.12VOICE [intransitive] if someone’s voice sinks, it becomes very quiet: sink into Sarah’s voice sank into a whisper.13have/get a sinking feeling to have or get a bad feeling when you suddenly realize that something bad is going to happen: I had a sinking feeling in the pit of my stomach.14sink so low (also sink to doing something) to be dishonest enough or selfish enough to do something very bad or unfair SYN stoop: How could he have sunk so low?15sink or swim to succeed or fail without help from anyone else: Law school is tough – it really is sink or swim.[Origin: Old English sincan]sink in phrasal verb if information, facts, etc. sink in, you gradually understand them or realize their full meaning: It took a moment for what he had said to sink in.sink something into something phrasal verb1to spend a lot of money on something SYN invest: They had sunk their entire savings into their house.2to put something sharp into someone’s flesh, into food, etc.: Walters sank his harpoon into the whale.3sink your teeth into something a)to bite into something or start to eat it: We couldn’t wait to sink our teeth into one of those burgers. b)to become actively involved in something that you think is very interesting: a movie role he can really sink his teeth into verb | noun
sinksink2 ●●● S3 noun [countable] 
an open container in a kitchen or bathroom that you can fill with water and use for washing your hands or face, or for washing dishes, etc. SYN washbasin → see also everything but the kitchen sink at kitchen (2)