to take hold of (something or somebody) eagerly with the fingers or arms

to take advantage of (something) enthusiastically

You must grasp this wonderful opportunity

to succeed in understanding (something)

(often + at) to make the motion of seizing

a firm hold

control or power

He is entirely in her grasp

the ability or opportunity to seize and hold or to attain something

Success was just beyond his grasp

understanding or ability to understand

a firm grasp of the subject