good as one's word, as

good as (one's) word

Trustworthy, reliable, and will do what one has promised. If Bob said he'll be here at nine, then he'll be here at nine—he's good as his word. I was worried that Ms. Alberts would forget about her promise of no homework over the weekend, but she was good as her word!
See also: good, word
Farlex Dictionary of Idioms.

good as one's word, as

Completely trustworthy, dependable, as in The boss said we could leave early on Friday and she was as good as her word. [Second half of 1500s]
See also: good
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • good as (one's) word
  • of word
  • be a man/woman of his/her word
  • as good as (one's) word
  • as good as word
  • be as honest as the day is long
  • (as) honest as the day is long
  • (there's) no saying
  • (there's) no telling
  • (there's) no knowing