underlever

As nouns the difference between terms and underlever

is that terms is while underlever is a lever behind the trigger guard of a rifle.

As a verb rifle

is .

As a noun underlever is

a lever behind the trigger guard of a rifle.

As nouns the difference between lever and underlever

is that lever is   A rigid piece which is capable of turning about one point, or axis (the fulcrum), and in which are two or more other points where forces are applied; — used for transmitting and modifying force and motion while underlever is a lever behind the trigger guard of a rifle.

As a verb lever

is to move with a lever.

As an adverb lever

is rather.