Remain Static Over Time, Like Stock Values Might

This page is the CodyCross answer for the clue below from Airport, Group 449, Puzzle 2 (Boarding Times).

Question is: Remain Static Over Time, Like Stock Values Might

and the answer is: FLATLINE

Word Meaning:

FLATLINE — (medicine, cardiology) An asystole; the absence of heart contractions or brain waves.

Definitions from Wiktionary.