Third-person singular simple present indicative form of walk the line

simple past tense of fall in line

simple past tense and past participle of toe the line

(physics) Any of the spectral lines forming a Balmer series.

plural of Balmer line

The bevel on a knife blade.

(obsolete) celestial equator / (obsolete, rare) the Equator

An imaginary line drawn between Saint Petersburg in Russia and Trieste in Italy, sometimes thought to divide Europe into two areas characterized by different levels of nuptiality, with lower marriage and fertility rates to the west, and higher rates to the east.

Alternative form of pick-up line

(gambling) A bookmaker's list of competitors and probable odds, published before the opening of the betting.