to keep a close eye on someone or something; to stare at or follow someone's movements; to mark a player in sports.

to shadow or follow someone secretly in order to keep watch on them

to stare fixedly or look at something with concentration

A basic defensive strategy in sports like basketball or soccer where each player is assigned to guard a specific opponent.

to record the value of an asset based on its current market price for accounting purposes

to gaze intently at; to scrutinize

to tail someone or follow them secretly

to watch very closely; to keep a tight watch on someone or something

to gaze or stare fixedly at someone or something

(idiom) a sports strategy where a player is guarded closely to prevent them from scoring