An Etymological Dictionary of Astronomy and Astrophysics

1. To compel by force, especially by law or authority.
   

   2. To obtain through the use of force, threat, or other
      forms of constraint.

Etymology (EN): M.E., from O.Fr. cohercier, from L. coercere “to restrain, surround,” form → com- “together” + arcere “to enclose, confine, keep off,” from PIE *ark- “to hold, contain, guard.”

Etymology (PE): Pazuridan, literally “to force against,” from pa- “contrary to; against; opposing,” → counter- + zur “power, force,” → strength, + infinitive suffix -idan.