Green’s Dictionary of Slang

eesecher! excl.

[backsl. ‘cheese it!’]

(UK und.) stop! be off! run away!

[UK]Mirror of Life 13 Apr. 6/1: [T]he late Mr. Blake, the then editor of the Sporting Life, when entering Tattersall's, was about, in professional language, to be ‘hung up’ for his ‘red lot,’ when one of the boys recognising the ‘ chief’ cried ‘eesecher,’ [...] a slang translator informed Mr. Blake that the mystic word eesecher was to ‘cheese it,’ otherwise to leave the ‘red lot’ alone.