attacher

to affix, bind, tie something to something else, especially with rope; to attach (durably bind, tie via links of emotional or physical dependence); to become attached, become fond of (grow emotionally bound to); to attach, attribute (a certain quality or value to); to exert oneself, to make an effort, to make a commitment

“Je me suis beaucoup attaché à cet animal.” — I've gotten very attached to this pet.

Inherited from Old French atachier, variant of estachier (“bind”), derived from estache (“stick”). Cognate with Old Occitan estacha, Italian stacca, Spanish estaca; from Gothic *stakka. Doublet of attaquer.