| SIN | a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof |
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| SIN | a slow fall or decline (as for lack of strength) |
| SIN | a descent as through liquid (especially through water) |
| SIN | a feeling caused by uneasiness or apprehension |
| SIN | a feeling caused by uneasiness or apprehension |
| SIN | a fund accumulated regularly in a separate account and used to redeem debt securities |
| SIN | a temporary decline in health or value |
| SIN | free from sin |
| SIN | the state of being free from sin or moral wrong |
| SIN | an Irish republican political movement founded in 1905 to promote independence from England and unification of Ireland |
| SIN | a person who sins (without repenting) |
| SIN | an act that is regarded by theologians as a transgression of God's will |