undersend

From Middle English *undersenden (attested only in the past participle undersent), equivalent to under- +‎ send. Compare Dutch onderzenden, Middle High German undersenden.

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undersend (third-person singular simple present undersends, present participle undersending, simple past and past participle undersent)

1. (transitive) To send beneath, under, or through; submit.
   • 1895, Francis Rye, Mrs. Amy (Haslam) Rye, Walter Rye, Calendar of correspondence and documents:

     Is sorry Sir Bassingbourne should have so much trouble in getting his glass. Undersends the charge.

   • 1977, Han'guk Chŏngsin Munhwa Yŏn'guwŏn, Korea observer:

     About the time when the United States undersent a change in its status, the change projected into the Korea-United States relations was expressed in the form of the problem of the U.S. troop withdrawal.

   • 2007, Fred M. Kusumoto, Nora F. Goldschlager, Cardiac Pacing for the Clinician:

     […] ICD oversensing of pacing stimuli, ICD underdetection of ventricular arrhythmias owing to the presence of pacing stimuli (which in turn result from undersending of the arrhythmia), and direct damage to the pacing system […]

2. (transitive, intransitive) To send less than required, needed, or requested.
   • 1997, http://tools.ietf.org/html/draft-clark-diff-svc-alloc-00:

     One approach would be to build a meter that looks at the very long-term average rate, and allows the TCP to send so long as that average is less than the target rate. However, this has the severe drawback that if the TCP undersends for some time because it has no data to send, it builds up a credit in the meter that allows it to exceed the average rate for an excessive time.

   • 2011, https://web.archive.org/web/20160305005336/https://sellercentral.amazon.com/forums/thread.jspa?threadID=14372&tstart=-1:

     […] for you to oversend something, couldn't it have been just as easy to undersend something?

   • 2011, http://www.emtlife.com/showthread.php?t=24073&page=2:

     Better to over send than undersend. I wouldn't give the triage colors to dispatch, because, quite honestly, they don't care.

undersend (plural undersends)

1. That which is undersent or submitted.
   • 2012, https://web.archive.org/web/20130315153440/http://www.kingcounty.gov/healthservices/health/ems/community/emdprogram.aspx?print=1:

     We are also able to evaluate oversends and undersends and trends in our system.

• upsend