"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
1. till
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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