From The Collaborative International Dictionary of English v.0.48:
Rush \Rush\ (r[u^]sh), v. i. [imp. & p. p. Rushed (r[u^]sht);
p. pr. & vb. n. Rushing.] [OE. ruschen; cf. AS. hryscan to
make a noise, D. ruischen to rustle, G. rauschen, MHG.
r[=u]schen to rush, to rustle, LG. rusken, OSw. ruska, Icel.
& Sw. ruska to shake, Dan. ruske to shake, and E. rouse.]
1. To move forward with impetuosity, violence, and tumultuous
rapidity or haste; as, armies rush to battle; waters rush
down a precipice.
[1913 Webster]
Like to an entered tide, they all rush by. --Shak.
[1913 Webster]
2. To enter into something with undue haste and eagerness, or
without due deliberation and preparation; as, to rush
business or speculation.
[1913 Webster]
They . . . never think it to be a part of religion
to rush into the office of princes and ministers.
--Sprat.
[1913 Webster]