(v) to fully understand a fact or an idea, especially a complicated one, (v) to become completely involved in an activity, (v) to understand sth completely and remember it, (v) to try extremely hard to achieve something, even though it is very difficult, (adj) competent or skilled in doing or using something, (v) to continue to have the knowledge, keep it in memory, (v) to learn a new language, (v) to get a new skill by your own hard work, (v) to continue to do something in a determined way, (v) to gradually but firmly put knowledge in a person's mind.

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