(US, idiomatic, slang, euphemistic) In secret. / (US, idiomatic, slang, euphemistic) Secretly sleeping with someone other than one's partner.

(cricket, of a batsman) Having the weight on the back foot in order to play a defensive stroke / (idiomatic) in a defensive posture; on the defensive; off balance; at a disadvantage.

(nautical) On the deck of a ship, especially of a captain or officer; in charge. / (baseball) Being the batter who will be up next, typically when that player is waiting on the field.

(transitive) to interfere with, or intrude on something forcibly

(idiomatic) coming, approaching

Whilst travelling.

(of goods or services) free, complimentary

(informal) To damage; to treat harshly; to produce ill effects in.

(idiomatic) Delighted; ecstatic; exceptionally pleased, happy, or satisfied.

Excellent; bold; performing well. / (chiefly US, law, philosophy) Having a direct application to the case or topic under consideration; apposite, relevant. / (ballet) On the tips of the toes; en pointe.