(colloquial) That which belongs to both of them; the possessive third-person plural pronoun used without a following noun.

(idiomatic) Willingly; readily. / Used other than figuratively or idiomatically: see with, both, hands.

(archaic) A factotum.

(informal, figuratively) The maximum damage that a weapon can deliver.

(derogatory) To engage in bothsidesism, to treat a policy debate or controversy as a conflict between two equally valid (or equally dangerous, etc) viewpoints.

simple past tense and past participle of both-sides

present participle of both-sides

(historical) An early form of iron lung.

plural of Both respirator

Using both hands.