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had better (do something)
Should. You had better listen to what I'm saying before you get yourself into more trouble.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
Also, had best. Ought to, should. For example, You had better finish this one before starting another, or We had best be going. [Mid-1400s] Also see you'd better believe it.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
had better/best Usage Problem
To be wise or obliged to; should or must: He had better do what he is told. You had best bring a raincoat in this weather.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.