Macushla is an Irish song copyright

Copyright

Copyright is a legal concept, enacted by most governments, giving the creator of an original work exclusive rights to it, usually for a limited time...

ed circa 1910 with music by Dermot MacMurrough and lyrics

Lyrics

Lyrics are a set of words that make up a song. The writer of lyrics is a lyricist or lyrist. The meaning of lyrics can either be explicit or implicit. Some lyrics are abstract, almost unintelligible, and, in such cases, their explication emphasizes form, articulation, meter, and symmetry of...

 by Josephine V. Rowe. The title is a transliteration

Transliteration

Transliteration is a subset of the science of hermeneutics. It is a form of translation, and is the practice of converting a text from one script into another...

 of the Irish

Irish language

Irish , also known as Irish Gaelic, is a Goidelic language of the Indo-European language family, originating in Ireland and historically spoken by the Irish people. Irish is now spoken as a first language by a minority of Irish people, as well as being a second language of a larger proportion of...

 mo chuisle meaning "my pulse

Pulse

In medicine, one's pulse represents the tactile arterial palpation of the heartbeat by trained fingertips. The pulse may be palpated in any place that allows an artery to be compressed against a bone, such as at the neck , at the wrist , behind the knee , on the inside of the elbow , and near the...

" as used in the phrase a chuisle mo chroí (pulse of my heart) meaning "darling" or "sweetheart".

It was used in the end credits of the 1996 film Michael Collins

Michael Collins (film)

Michael Collins is a 1996 historical biopic written and directed by Neil Jordan and starring Liam Neeson as General Michael Collins, the Irish patriot and revolutionary who died in the Irish Civil War. It won the Golden Lion at the Venice Film Festival....

.

It is inscribed ("Mo cuishle") on the silks of boxer Maggie Fitzgerald (Hillary Swank) in the 2004 film Million Dollar Baby

Million Dollar Baby

Million Dollar Baby is a 2004 American sports drama film directed, co-produced, and scored by Clint Eastwood and starring Eastwood, Hilary Swank, and Morgan Freeman...

, and is chanted by various crowds in the film numerous times.