His conversation when he does not fly off at a tangent is full of pith and idea.
But, look out, fellow strollers, for we are off in a tangent!
The mere thought of the hospital sent her mind flying off at a tangent.
There wasn't a half mile of tangent at a single stretch in the whole of it.
The complement of the logarithm of a sine, tangent, or secant.
Or thus: if it ...