Those who want to make a good impression outwardly are trying to compel you to be circumcised. They only do this to avoid persecution for the cross of Christ.
KJV
As many as desire to make a fair shew in the flesh, they constrain you to be circumcised; only lest they should suffer persecution for the cross of Christ.
ASV
As many as desire to make a fair show in the flesh, they compel you to be circumcised; only that they may not be persecuted for the cross of Christ.