Meaning of "a bit at"

[rasha]

Synonym Search, Intermediate level

ESL/EFL Test #125 "Synonyms for task and duty", question 9

We can work out a ......... a bit at a time

(a) plan
(b) design
(c) formula
(d) method

Synonym Search, Intermediate level

ESL/EFL Test #125 "Synonyms for task and duty", answer 9

We can work out a plan a bit at a time

Correct answer: (a) plan
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what the meaning of a bit at

rasha

[Conchita]

A bit: a little

At a time: each time, at one time

A bit at a time: little by little, step by step, gradually