To find the 43rd term of the sequence described by the formula \( a_n = -37n + 8 \), we substitute \( n = 43 \) into the formula.
\[ a_{43} = -37(43) + 8 \]
First, we calculate \( -37 \times 43 \):
\[ -37 \times 43 = -1591 \]
Now, we add 8 to this result:
\[ a_{43} = -1591 + 8 \] \[ a_{43} = -1583 \]
Thus, the 43rd term of the sequence is
\[ \boxed{-1583} \]