The Collaborative International Dictionary of English v.0.48:
Echo \Ech"o\, v. t. [imp. & p. p. Echoed; p. pr. & vb. n.
Echoing. -- 3d pers. sing. pres. Echoes.]
1. To send back (a sound); to repeat in sound; to
Those peals are echoed by the Trojan throng.
The wondrous sound
Is echoed on forever. --Keble.
2. To repeat with assent; to respond; to adopt.
They would have echoed the praises of the men whom
they envied, and then have sent to the newspaper
anonymous libels upon them. --Macaulay.