what does "put his foot in it" mean?

[Janita]

English Idioms and Expressions, Intermediate level

ESL/EFL Test #1 "Up to his ears", question 10

You can always rely on Fred to put his foot in it and come out with a remark like that.

(a) tread on somebody
(b) fall over
(c) say something embarrassing
(d) put on the wrong shoe

English Idioms and Expressions, Intermediate level

ESL/EFL Test #1 "Up to his ears", answer 10

You can always rely on Fred to say something embarrassing and come out with a remark like that.

Correct answer: (c) say something embarrassing
_________________________

what does put his foot in it mean?

Janita

[Mister Micawber]

.
Say something embarrassing or inappropriate.
.
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Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber