
unterschreiten
to fall below
To drop below a certain limit, measurement, or fixed value, or to fail to reach it.
Die Temperatur hat in der Nacht den Gefrierpunkt unterschritten.
The temperature fell below freezing during the night.
to fall below / fail to meet
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to fall below
To drop below a certain limit, measurement, or fixed value, or to fail to reach it.
Die Temperatur hat in der Nacht den Gefrierpunkt unterschritten.
The temperature fell below freezing during the night.

to fail to meet
To fail to meet a required quality, performance level, or standard.
Der Kandidat hat die Mindestanforderungen für die Stelle leider unterschritten.
Unfortunately, the candidate failed to meet the minimum requirements for the position.
'Unterschreiten' (to fall below / fail to meet) is an inseparable verb. The prefix 'unter-' remains firmly attached to the verb in all tenses and sentence constructions.
Er hat die vorgeschriebene Zeit leider unterschritten.
Unfortunately, he came in under the required time.
The word is made up of 'unter' (under) and 'schreiten' (to step, to walk). Figuratively, it describes going below a line or level.
Die Verkaufszahlen haben die Erwartungen deutlich unterschritten.
The sales figures fell clearly below expectations.
The verb 'unterschreiten' (to fall below / fail to meet) is always used with an accusative object. You ask: whom or what is being fallen below?
Der Läufer unterschritt den alten Rekord um drei Sekunden.
The runner beat the old record by three seconds.
When the context is about numbers, measurements, or concrete limits (e.g., temperature, price, time), the first meaning is intended. When it is about abstract things like quality or expectations, the second meaning is intended.
Der Aktienkurs hat die 100-Euro-Marke unterschritten.
The share price fell below the 100-euro mark.
to miss
Both words can express that a desired performance result was not achieved. „Unterschreiten“ presupposes a specific limit, value, or standard; „verfehlen“ refers more generally to failing to reach the intended goal or achieve the intended effect. For a clear minimum threshold, „unterschreiten“ is appropriate; otherwise, „verfehlen“ is usually the better choice.

Die Mannschaft unterschritt die geforderte Punktzahl und gewann das Spiel nicht.
The team fell short of the required score and did not win the game.
Die Mannschaft verfehlte ihr Ziel und gewann das Spiel nicht.
The team missed its goal and did not win the game.