This is the 8149th most frequent Polish word.
odrę
"Odrę" is the accusative form of "odra," which means "measles" or refers to the Oder River in Polish, depending on context.
In this sentence, 'odrę' refers explicitly to 'measles,' a contagious disease.
Wczoraj dowiedzieliśmy się, że nasz kolega zachorował na odrę.
Yesterday we learned that our colleague fell ill with measles.
Here, 'odrę' implies 'by hand,' describing the manner in which the note is written.
Piszę tę notatkę odrę, aby szybciej ją przekazać.
I am writing this note by hand to pass it along more quickly.
In this context, 'odrę' refers to the 'current of the river,' specifying what aspect of the river is under examination.