It's a little ___ funny ... (start of Elton John's Your Song)
• The part of a bridle, usually of iron, which is inserted in the mouth of a horse, and having appendages to which the reins are fastened. • Fig.: Anything which curbs or restrains. • To put a bridle upon; to put the bit in the mouth of. • imp. & p. p. of Bite. • A part of anything, such as may be bitten off or taken into the mouth; a morsel; a bite.