(grammar) The infinitive form of an English verb without the particle to; a comparable infinitive in other Germanic languages, e.g. a German infinitive without a preceding "zu", or a Swedish one without a preceding "att".

(idiomatic) To know all there is to be known about a certain discipline.

(humorous, euphemistic) Lacking in intelligence; dimwitted.

In good condition; energetic.

Appropriate, relevant, pertinent.

plural of not the sharpest knife in the drawer

(chiefly Britain) Alternative form of get a word in edgewise

(US, usually in the negative) To break into or participate in a conversation.

(idiomatic, transitive) to give up, to quit

(idiomatic, transitive) To give up, to quit. / (idiomatic) To include (especially of a large amount). / (mountain climbing) To transport to base camp, especially by backpack.