in and out

1. Thoroughly; down to the last detail. I've been studying this material for weeks now, so I know it in and out.

2. Alternating between being at or in a location and being gone from it. The boss has been in and out of the office all day.

ˌin and ˈout (of something)

going regularly to a place: I’ve been in and out of the travel agency all this week, trying to arrange my holiday. After the accident, he was in and out of hospital for a couple of years.

词组	in and out
释义	in and out in and out 1. Thoroughly; down to the last detail. I've been studying this material for weeks now, so I know it in and out. 2. Alternating between being at or in a location and being gone from it. The boss has been in and out of the office all day. See also: and, out Farlex Dictionary of Idioms. ˌin and ˈout (of something) going regularly to a place: I’ve been in and out of the travel agency all this week, trying to arrange my holiday. After the accident, he was in and out of hospital for a couple of years. See also: and, out Farlex Partner Idioms Dictionary See also: know (someone or something) like a book know like a book a (real) gas back and forth career checkered checkered career DC Ac AC/DC
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