A rare British spelling variant of install, most notably used in the specific sense of paying by instalments. The truncated spelling reflects older British usage where the double-l was sometimes avoided. Now unusual in standard British writing, which has largely standardised on install.
He arranged to instal the new cooker over three monthly payments.
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(British, rare) To pay by instalments.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.