I. ˈred-ˈlīn noun
Date: 1952
: a recommended safety limit : the fastest, farthest, or highest point or degree considered safe ; also : the red line which marks this point on a gauge
II. ˈred-ˌlīn, -ˈlīn
Date: 1968
intransitive verb
: to withhold home-loan funds or insurance from neighborhoods considered poor economic risks
transitive verb
: to discriminate against in housing or insurance