buy in is a verb meaning "amass so as to keep for future use or sale or for a particular occasion or use". It carries one recorded sense.
amass so as to keep for future use or sale or for a particular occasion or use
“let's stock coffee as long as prices are low”
commerce
Definitions, synonyms and semantic relations for buy in come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.