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3. know through and through

know through and through

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know something through and through

to know something very well. I want you to know this project through and through before the staff meeting. I know my part in the play through and through.

See also: and, know

know somebody through and through

to know someone very well and know everything about them She tried to hide her disappointment, but I know her through and through and I could tell she was upset.

See also: and, know