The Collaborative International Dictionary
Overhand \O"ver*hand`\, a.
(Sewing) Over and over; -- applied to a style of sewing, or to a seam, in which two edges, usually selvedges, are sewed together by passing each stitch over both.
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(Baseball, Cricket, Tennis, etc.) Done (as pitching or bowling) with the hand higher than the elbow, or the arm above, or higher than, the shoulder; as, an overhand pitch; an overhand stroke.
Overhand knot. See Illustration of Knot.
Wiktionary
n. A particular, very simple knot, used e.g. to prevent the end of a rope from unravel, and as part of other knots.
WordNet
n. a simple small knot (often used as part of other knots)
Wikipedia
The overhand knot is one of the most fundamental knots, and it forms the basis of many others, including the simple noose, overhand loop, angler's loop, reef knot, fisherman's knot, and water knot. The overhand knot is a stopper, especially when used alone, and hence it is very secure, to the point of jamming badly. It should be used if the knot is intended to be permanent. It is often used to prevent the end of a rope from unraveling.
Usage examples of "overhand knot".
The Shamud produced a length of cord and, with one overhand knot, made a loop.
There was knotted little bit of metal in the palm of Jane's thin little hand a gold ring tied in an overhand knot with no sign of a break or a weld.
The stressing and jerking of the straps, which Iwoso could feel through the back of her neck, was the result, merely, of my looping part of one strap about the other and then jerking against it, the secont strap end, of course, falling free as soon as I released it, leaving only the first knot in place, the simple over-and-under, or overhand knot.
The nylon stocking appears to have been tightly affixed by the usual overhand knot first and in the formation of the second knot, one limb of the free end has been looped under a partial slip knot, which is quite tightly drawn up.