give the high sign

alarm forewarn inform notify tip off

flag signal tip

put on guard wave flag

conceal hide

admonish alert exhort forewarn urge

flag tip

give the lowdown on pull one's coat put one wise tip off wave a red flag wise one up

admonish apprise dissuade tip off

advise alarm alert flag portend telegraph tip

forbode give fair warning premonish pull one's coat put a bug in one's ear put on guard put one wise wave a red flag

flag gesticulate indicate mime motion pantomime sign signal wave

act out use one's hands use sign language

address advise alert caution hint inform instruct notify order predict prepare prompt recommend remind signal suggest summon tell threaten urge

acquaint admonish advocate apprise clue counsel deprecate direct dissuade enjoin exhort forbid forearm forewarn guide post prescribe remonstrate reprove tip

clue in cry wolf fill in give fair warning give warning lay it out make aware put on guard tip off wise up

conceal discourage disorganize dissuade hide ignore prevent

allow approve commend compliment laud misguide mislead neglect permit praise withhold