What is to toot gently, repeatedly, or continuously, on a wind instrument, as a flute; also, to make a similar noise by any means. "The tootling robin." John Clare called?

tootle — To toot gently, repeatedly, or continuously, on a wind instrument, as a flute; also, to make a similar noise by any means. "The tootling robin." John Clare. (Webster's 1913.)