Every Saturday I’ll give you a couple of idioms to learn. An idiom is a saying or phrase whose meaning cannot be taken from the literal meanings of the words.
double-check: review for mistakes, make sure everything is correct.
Example:
Double-check the copy for that brochure before it gets sent to the printer—it would be embarrassing if there were mistakes it in.
gain ground: make progress or improvement, move forward.
Example:
Our new product line has enabled us to increase our market share and gain ground against our closest competitor.