wise one up

admonish alert exhort forewarn urge

flag tip

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

admonish advise advocate caution charge confab direct enjoin exhort guide huddle inform instruct kibitz order prescribe prompt recommend reprehend steer suggest teach tip tout urge warn

give pointer give two cents keep posted put bug in ear put heads together put on to show the ropes tip off

approve conceal discourage dissuade hide learn misguide mislead neglect prevent