mark (an item) for attention or treatment in a specified way

the spellcheck program flags any words that are not in its dictionary

(of an official) raise a flag to draw the referee's attention to a breach of the rules in soccer, rugby, and other sports

the goalkeeper brought down Hendrie and a linesman immediately flagged

provide or decorate with a flag or flags

become tired or less enthusiastic or dynamic

if you begin to flag, there is an excellent cafe to revive you

becoming tired or less dynamic; declining in strength

she wants to revive her flagging career