"tills" in the noun sense
1. till, boulder clay
unstratified soil deposited by a glacier consists of sand and clay and gravel and boulders mixed together
2. public treasury, trough, till
a treasury for government funds
3. cashbox, money box, till
a strongbox for holding cash
"tills" in the verb sense
work land as by ploughing, harrowing, and manuring, in order to make it ready for cultivation
"till the soil"
Source: WordNet® (An amazing lexical database of English)
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