"Didn't" is the contraction of "did not," used to make the simple past negative. It goes before the base verb to show an action did not happen or a fact was untrue. It is common in speech and informal writing.
About two weeks ago, a firefighter didn't feel well and let us know immediately. Source: Internet
Aaron Smith retains top spot this week after the Highlanders had the bye and those at his heels didn't do enough to displace him. Source: Internet
"A buddy of mine suggested Sin Eaters, which I didn't realize is an actual thing," said Peddle. Source: Internet
Abi Na'eem, "Ma'arifat al-sahaba", no. 60 He was called Al-Siddiq (the truthful) by Muhammad after he believed him in the event of Isra and Mi'raj when other people didn't, and Ali confirmed that title several times. Source: Internet
A bypass is what happened to me when I didn't get The Tonight Show! Source: Internet
According to a very conservative friend of mine back during Katrina, if those people didn't want to deal with hurricanes, they shouldn't live there. Source: Internet