go over like a lead balloon
fall back
plead the Fifth
whistle in the wind
dissatisfy
let down
disappoint
have someone there
come up with snake eyes
preach in the desert
leave someone cold
retract
die on one's arse
whistle for
stonewall
lose one's nerve
lose one's tongue
blow smoke
underwhelm
underachieve
not be 100 percent on something
swallow one's words
misspeak
go in one ear and out the other
stump
scant
tongue-tie
make default
spoil the ship for a ha'p'orth of tar
go nowhere
make neither head nor tail of
spit it out
strike out looking
undersing
unsatisfy
sit on one's hands
nonconform
give out
make head nor tail of
mump
unsubstantiate
bail
pass
rope into