What is the meaning of Attacher?

Someone who attaches.

A means of attaching.

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 [with à]

Source: wiktionary.org