Question

write meaning of the sentence His maiden speech fell very flat

Answer 1

maiden speech is the first speech given by a newly elected or appointed member of a legislature or parliament. Traditions surrounding maiden speeches vary from country to country.
to fall flat. phrase. If an event or attempt falls flat or falls flat on its face, it is unsuccessful. Liz meant it as a joke but it fell flat.

Answer 2

countable noun

A politician's maiden speech is the first speech that he or she makes in parliament after becoming a member of it.

politics, British

the first speech that a politician makes in parliamentafter becoming a member of it

He did not deliver a maiden speech, which was for the best.Louise Carpenter AN UNLIKELY COUNTESS: Lily Budge and the 13th Earl of Galloway (2004)He certainly did not do that when he stoodup in the Commons to deliver a moving maiden speech that tackled the issue of disability.Times, Sunday Times (2011)The new young senator from Queenslandwas about to make his maiden speech - and had invited journalists to interview him while he was composing it.