What is another word for at drop of hat?
Pronunciation: [at dɹˈɒp ɒv hˈat] (IPA) 
"At drop of hat" is an idiom that means to do something immediately without any hesitation. The phrase originated during the 19th century, where the drop of a hat would signify the beginning of an event like a horse race. Some common synonyms for "at drop of hat" include instantly, immediately, promptly, without delay, and on the spur of the moment. Other phrases that have similar meanings are "at the snap of a finger," "in a heartbeat," and "in no time." These phrases have become popular in daily conversations when someone needs to indicate that he or she is readily available to help or act.
