in the groove

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1. A long narrow furrow or channel.
2. The spiral track cut into a phonograph record for the stylus to follow.
3. Slang A settled routine: got into the groove of a nine-to-five job.
4. Slang A situation or an activity that one enjoys or to which one is especially well suited: found his groove playing bass in a trio.
5. Slang A very pleasurable experience.
v. grooved, groov·ing, grooves
1. To cut a groove or grooves in.
2. Baseball To throw (a pitch) over the middle of home plate, where it is likely to be hit.
v.intr. Slang
a. To take great pleasure or satisfaction; enjoy oneself: just sitting around, grooving on the music.
b. To be affected with pleasurable excitement.
2. To react or interact harmoniously.
in the groove Slang
Performing exceptionally well.

[Middle English groof, mining shaft, probably from Middle Dutch groeve, ditch; see ghrebh- in Indo-European roots.]

in the groove

- An allusion to the reproduction of music by a needle on a gramophone record.
See also related terms for needle.
References in classic literature ?
He carried in his coat pocket a shallow box with grooves in it, and in the grooves strips of glass five inches long and three inches wide.
Both right and left maxillary lateral incisors were carefully examined for the presence and extension of PGGs and the presence of caries in the grooves, using a mouth mirror and dental explorer.
Nevertheless, water molecules in the grooves may form chains or networks that extend throughout the protein surface.