What does "shake on that" mean?

[Andy]

Business Idiom in English, Intermediate level

ESL/EFL Test #137 "Ways of agreeing", question 10

The ......... seem eminently suitable to me.

(a) tendencies
(b) actualities
(c) events
(d) terms

Business Idiom in English, Intermediate level

ESL/EFL Test #137 "Ways of agreeing", answer 10

The terms seem eminently suitable to me.

Correct answer: (d) terms

Your answer was: incorrect
The tendencies seem eminently suitable to me.
_________________________

what does "shake on that" mean??

Andy

[Mister Micawber]

.
Shake hands to seal that agreement.
.
_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber