The phrase "a sudden step" is correct and usable in written English.
It can be used to describe an unexpected or abrupt action taken by someone, often in a physical or metaphorical sense.
Example: "With a sudden step, she moved away from the crowd, seeking solitude in the quiet park."
Alternatives: "an abrupt move" or "a quick action".
"I'm sure it would be a very big step for him to all of a sudden step in and start playing football.
BLOOMBERG At UBS, I-Banking a "Difficult Stepchild" | Long one of Europe's major investment banks, UBS is taking a sudden step away from a core business, The New York Times reports.
The intra cellular labeling dynamics are excited by a sudden step increase of the 13C portion in the substrate feed.
To prove the superiority of ASOS algorithm over SOS algorithm and T2FPIDF controller over other proposed controllers, transient performance of the AGC system is studied by applying a sudden step load change of 10% in area-1 of the two unequal area power system.
A drop-off is a sudden step down, as a curb or a sunken room floor.
The elective mode differs from the others in four respects: a) The patient's healthcare condition undergoes a sudden step-like change as a result of the clinical intervention.
For perforated patch recordings, any sudden step change was taken as indicative of break-in and the recording discarded.
One set of hypotheses proposes that the internalization occurred in a single, sudden step, either by fortuitous rupture of the host membrane [ 20, 21] or incidental [ 22] engulfment by "a primitive process of particle engulfment" of the alphaproteo bacteria (usually called the symbiont) by the host.
The accident vehicle/wind speed associated with such an event is currently estimated by applying a 0.5 s sudden step crosswind gust to the vehicle to see if overturning, sideslip or rotation accident will occur.
If an earthquake strikes, it imposes a sudden stress step ΔCFF, and the state variable γn−1 changes to a new value γ n (4 where Aσ is a constitutive parameter times the effective normal stress, assumed to be 0.05 MPa (Toda and Stein, 2003).
In particular, if USV was broken by a sudden downward step, with a harmonic at the octave, it was named a "broken" USV.
