harness
Pronunciation: /ˈhɑːnɪs/
noun
verb

Phrases
-
in harness
- (of a horse or other animal) used for driving or draught work: colts are worked in harness alongside an experienced horse
- in the routine of daily work: a man who died in harness far beyond the normal age of retirement
- so as to achieve something together: local and central government should work in harness

Origin:
Middle English: from Old French harneis 'military equipment', from Old Norse, from herr 'army' + nest 'provisions'