What does «acollarar» mean in Spanish?

Put collar.
Join animals by collars.
Putting collars on horses.
To join or bind two animals, persons or things.

♦ Used in: Argentina - Chile
(acollararse) To get involved in love.

♦ Used in: Argentina
(acollararse) Marriage.

♦ Used in: Argentina

Examples of use in Spanish: "Cuando una se decide acollararse (o casarse) con el enamorado, suele creer que ya lo sabe todo de su hombre".
(acollararse) Cohabitation.

♦ Used in: Argentina