hold the line

verbs

hold the line on prices; keep the price of something constant
hold the line
is a type of (narrower)
keep in safety and protect from harm, decay, loss, or destruction
"We preserve these archeological findings"; "The old lady could not keep up the building"; "children must be taught to conserve our national heritage"; "The museum curator conserved the ancient manuscripts"
conserve, keep up, maintain, preserve
hold the phone line open
"Please hang on while I get your folder"
hang on, hold on, hold the line