to give quarter
Building blocks
halas-
-ta-
causative (“make something be X”),-ma - infinitive ending
This verb cannot be broken down much further as it is likely derived from Proto-Finnic.
There is an Estonian word “hale” which means pitiful. Therefore the word halastama can mean to have mercy on someone pitiful.
How to use it
To whom you are having mercy on to is in the allative case (ending on “-le”)
Examples
Jalgpallimeeskond ei halastanud konkurendile
Literally: “Football team no had mercy onto competitor”
Idiomatically: “The football team had no mercy on the competitor”
Jalgpallimeeskond - Noun - Nom Sg, "Football team"
ei halastanud - Verb - 3P Past Sg Neg, "no had mercy"
konkurendile - Noun - Allative Sg, "onto competitor"
Ilm halastas matkajatele
Literally: “Weather had mercy onto hikers”
Idiomatically: “The weather had mercy on the hikers”
Ilm - Noun - Nom Sg, "Weather"
halastas - Verb - 3P Past Sg, "had mercy"
matkajatele - Noun - Allative Pl, "onto hikers"